Selecting master time of day for maximum redundancy
AssigneeInternational Business Machines Corporation
InventorsManish Kumar Chowdhary, Deepak Kodihalli
Life of this patent
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Abstract
An approach is provided in which a system selects a first processor as a master Time of Day (TOD) processor in a first TOD topology in response to determining that the first processor is directed connected to an oscillator. The system then assigns a second processor as an alternate master TOD processor to a second TOD topology based upon determining that the second processor is on a different node than the first processor. The system configures to the first TOD topology and, when the system detects a TOD failure, the system re-configures to the second TOD topology.
Claims20
A method implemented by an information handling system that includes a memory and a plurality of processors, the method comprising:
- selecting a first one of a plurality of processors as a master time of day (TOD) processor in a master TOD topology based on determining that the first processor is directly connected to a single oscillator, wherein the first processor is located on a first node;
- assigning a second one of the plurality of processors as an alternate master TOD processor to a backup TOD topology based upon determining that the second processor is on a second node that is different than the first node;
- configuring the information handling system to the master TOD topology;
- and
- in response to detecting a TOD failure on the master TOD topology, re-configuring the information handling system to the backup TOD topology.
An information handling system comprising:
- a plurality of processors;
- a memory coupled to at least one of the plurality of processors;
- and
- a set of computer program instructions stored in the memory and executed by at least one of the plurality of processors in order to perform actions of:
- selecting a first one of the plurality of processors as a master time of day (TOD) processor in a master TOD topology based on determining that the first processor is directly connected to a single oscillator, wherein the first processor is located on a first node;
- assigning a second one of the plurality of processors as an alternate master TOD processor to a backup TOD topology based upon determining that the second processor is on a second node that is different than the first node;
- configuring the information handling system to the master TOD topology;
- and
- in response to detecting a TOD failure on the master TOD topology, re-configuring the information handling system to the backup TOD topology.
A computer program product stored in a computer readable storage medium, comprising computer program code that, when executed by an information handling system, causes the information handling system to perform actions comprising:
- selecting a first one of a plurality of processors as a master time of day (TOD) processor in a master TOD topology based on determining that the first processor is directly connected to a single oscillator, wherein the first processor is located on a first node;
- assigning a second one of the plurality of processors as an alternate master TOD processor to a backup TOD topology based upon determining that the second processor is on a second node that is different than the first node;
- configuring the information handling system to the master TOD topology;
- and
- in response to detecting a TOD failure on the master TOD topology, re-configuring the information handling system to the backup TOD topology.
Dependencies are inferred from the claim text.